BAP Mariátegui (FM-54) is the last out of four Carvajal class frigates ordered by the Peruvian Navy in 1973. It was built by SIMA (Servicio Industrial de la Marina, Navy Industrial Service) at Callao under license from the Italian shipbuilder Cantieri Navali Riuniti. Shortage of funds and technical difficulties delayed her completion for several years, being finally commissioned in 1987. In 1998 her flight deck was extended to allow ASH-3D Sea King helicopters to land and refuel, even though they can't be housed in the ship's hangar.